ANT CAVITY FOR NON-DISRUPTIVE, C A s c m c b d t b g T q T

bstract We describe a beamline cavity designed to detect the pace charge quadrupole moment of a beam. Used in onjuction with a beam position monitor, it can provide a easurement of. In a FODO array, several such avities installed at different phase locations in the etatron lattice can afford a means of acquiring non-isruptive, single-shot measurements of a beams ransverse emittances [1]. The device described is asically a square copper cavity oriented at 45º at a short ap in the beampipe. It is designed to resonate in its M σ